I am new to combustion. Im having trouble getting nice shadows in my composite. I have an object sitting in front of an image with a g buffer builder operator and it is understanding z depth and creating shadows nicely....but in the foreground I have these strange posterized sort of lines....I have a gut instinct that there is something wrong with my zbuffer or normal channels but I dont know enough to pinpoint the issue and the files themselves look fine....

any ideas what I might be doing wrong? Oh one more thing - the issue does not really occur with a distant light, only with point, or target light